Tuning Reductive and Oxidative Photoinduced Electron Transfer in Amide‐Linked Anthraquinone–Porphyrin–Ferrocene Architectures
作者:Jascha Melomedov、Julian Robert Ochsmann、Michael Meister、Frédéric Laquai、Katja Heinze
DOI:10.1002/ejic.201400118
日期:2014.4
Zn-6a–Zn-6h. The Q-PAr1 dyad (Ar1 = C6H5) was further extended with a second porphyrin PAr2 (Ar2 = 4-C6H4Me) as well as appended to a ferrocene to give the tetrad Q-PAr1-PAr2-Fc 9. Almost all the conjugates show strongly reduced fluorescence quantum yields and excited-state lifetimes, which has been interpreted as photoinduced electron transfer (PET) either from the excited porphyrin to the quinone (oxidative
具有可调给电子能力的内消旋取代基 Ar 的卟啉氨基酸 3a-3h(Ar = 4-C6H4OnBu、4-C6H4OMe、4-C6H4Me、Mes、C6H5、4-C6H4F、4-C6H4CF3、C6F5)已连接在蒽醌 Q 作为电子受体的 N 末端通过酰胺键得到 Q-PAr 二元组 4a-4h。它们在 C 末端与二茂铁 Fc 共轭作为电子供体,得到受体-发色团-供体 Q-PAr-Fc 三联体 6a-6h。为了进一步改变电子激发态和电荷分离态的能量,三元组 6a-6h 用锌 (II) 金属化,得到相应的 Q-(Zn)PAr-Fc 三元组 Zn-6a-Zn-6h。Q-PAr1 二元组 (Ar1 = C6H5) 用第二个卟啉 PAr2 (Ar2 = 4-C6H4Me) 进一步扩展,并附加到二茂铁上以得到四元组 Q-PAr1-PAr2-Fc 9。几乎所有的共轭物都显示出强烈降低的荧光量子产率和激发态寿命,这被解释为从激发的卟啉到醌(氧化性